GCC 错误:非命名空间范围内的显式特化

问题描述

我正在尝试移植以下代码.我知道该标准不允许在非 namescape 范围内进行显式专业化，我应该使用重载，但我只是找不到在这种特殊情况下应用这种技术的方法.

I am trying to port the following code. I know the standard doesn't allow explicit specialization in non-namescape scope and I should use overloading, but I just can't find a way to apply this technique in this particular case.

class VarData
{
public:
    template < typename T > bool IsTypeOf (int index) const
    {
        return IsTypeOf_f<T>::IsTypeOf(this, index); // no error...
    }

    template <> bool IsTypeOf < int > (int index) const // error: explicit specialization in non-namespace scope 'class StateData'
    {
        return false;
    }

    template <> bool IsTypeOf < double > (int index) const // error: explicit specialization in non-namespace scope 'class StateData'
    {
        return false;
    }
};

推荐答案

您只需要将成员模板的特化移到类主体之外.

You just have to move your specializations of the member templates outside of the class body.

class VarData
{
public:
    template < typename T > bool IsTypeOf (int index) const
    {
        return IsTypeOf_f<T>::IsTypeOf(this, index);
    }
};

template <> bool VarData::IsTypeOf < int > (int index) const
{
    return false;
}

template <> bool VarData::IsTypeOf < double > (int index) const
{
    return false;
}

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